Supplies:

Step 1: Circuit Diagrams

In the first picture I've shown you the BC547 BJT's pin configuration . And in the 2nd picture diagram is for Water Level indicator . There will be another pin from battery's positive terminal . If you don't understand click here to ask me on facebook .

Step 2: Circuit Diagram and All the Stuffs

Just follow the instruction of that video . It'll be very easy for you to get this project done .